Introduction of the most important plant species and their morphological changes in order to adapt to the dry and desert conditions of Sistan

Sistan region is one of the driest regions of the world. Factors such as low rainfall, high evaporation, 120-day monsoon winds, low altitude, saline soils and multi-year drought resulted in more land degradation and loss of natural vegetation in the region. This study was carried out to investigate vegetation resistant to severe and drought conditions with the aim of identifying and maintaining consistent species in the rangelands and deserts of Sistan region. In order to carry out this research, in different seasons of the year, different regions (deserts and rangelands) of the region were visited and action was taken to the collection of complete samples of any species.With the study, the growth habits in them were identified the traits that make them resistant to hard conditions. Plants that are found in desert regions are consistent with the drought and tough conditions in the region and was deformed so that there are many differences in the appearance of plants with optimum conditions. These plants are adapted to characteristics such as having tolerance to drought and avoidance of dry conditions in the region. The results of this research showed that these plants have traits such as trichome (Grantia aucheri),change leaf-to-thistle (Alhagi camelorum), low leaves and their early fall (Pycnocycla spinosa), leaf with thick cuticle (Zygophyllum atriplicoides),change leaf to squama (Tamarix aphylla), root for absorbing moisture (Caparis spinosa), dusty leaf (Atriplex halimus), and save tissues (Cistanch salsa) tolerate drought, and others with shortened life spans (Stipagrostis plumosa) escape from adverse environmental conditions

Keywords:

Cover vegetation , Drought , Plant species , Desert